Outside of the realm of performance tuning (in which it excells) a vtec controler'll aid emissions testing and long trip fuel economy.
Is the vafc as good as the safc at fuel control? (i.e. dsm 450s & t3/t4 helper)

I've always liked my Hondata works well for changing vtec point... it also runs about the same price as Apex-I's units then again for some reason people think hondata cost an arm and a leg I paid 325 or 350 installed with the program of choice and I can also change rev limit, vtec point, shift light, and for about 5 mins of my shops time I can change my program to a Teg Type R or run a stock SI or or or...